电力机车诱发牵引系统谐振过电压研究
发布时间：2018-08-19 19:41
【摘要】：在我国铁路第六次大提速后,随着交直交车型的投入使用,在牵引供电系统中经常出现变电所断路器跳闸,电容器熔丝熔断、爆浆,避雷器爆炸等事故,造成上述事故通常是由于牵引负荷的大波动性引起系统内部的电磁暂态振荡,而造成系统内部过电压出现,其中谐振过电压就是一个典型。本文通过理论分析和建模仿真的研究方法,针对牵引供电系统中的谐振过电压进行了相关研究。 通过对牵引供电系统和交直交电力机车的理论分析,利用PSCAD/EMTDC仿真软件中的架空线模型建立用分布参数电路表示并可以反应频率变化对参数影响的牵引网模型,利用电机模型建立基于电机转子磁场定向控制的牵引传动系统的控制电路作为脉冲整流器的负载。经初步仿真,所得数据与理论分析结果相一致,实测数据也表明模型的正确性。 基于本文所建模型,通过分析牵引网阻频特性和交直交电力机车谐波特性研究了系统中的线性谐波谐振过电压,得出牵引网谐振频率和谐波源谐波电流共同决定着系统中的谐波过电压,谐振时出现的电压一般在40kV-50kV之间,电压畸变率均超过3%,且持续时间长；通过以电力机车过分相为激励条件研究了该过程中存在的铁磁谐振过电压,得出其谐振类型为分频谐振,谐振时出现的电压最高可达108.9kV,超过400mm绝缘子的工频耐受电压100kV。 最后根据谐波源特性以最小安装容量法设计了高通滤波器参数,用以改变牵引网的谐振频率并滤除谐波。通过对不同台数滤波器的安装位置进行仿真计算,得出一台安装于机车,一台安装于分区所效果最佳,若机车安装困难时,在分区所和变电所各安装一台也可使电压低于40kV,电压畸变率小于3%；从削弱铁磁谐振激励条件和消耗谐振能量两方面提出基于接触线电压相位控制电力机车过分相的综合抑制方案,达到抑制操作过电压和铁磁谐振过电压的双重目的,使该过程的过电压低于50kV。本文的研究成果对于牵引供电系统中的谐振过电压的理论分析和谐振过电压治理方法可以提供参考。
[Abstract]:After the sixth speed increase of the railway in our country, with the application of the AC-DC model, accidents such as breaker tripping of substation circuit breaker, fuse of capacitor fuse, explosive slurry, explosion of lightning arrester and so on often occur in the traction power supply system. The above accidents are usually caused by the electromagnetic transient oscillation in the system caused by the large fluctuation of the traction load and the emergence of the internal over-voltage of the system, in which the resonant overvoltage is a typical one. In this paper, the resonance overvoltage in traction power supply system is studied by theoretical analysis and modeling and simulation. Based on the theoretical analysis of traction power supply system and AC-DC electric locomotive, the traction network model is established by using the overhead line model in PSCAD/EMTDC simulation software, which is expressed by distributed parameter circuit and can reflect the influence of frequency change on parameters. The control circuit of traction drive system based on rotor flux oriented control is established by using motor model as the load of pulse rectifier. The preliminary simulation results show that the obtained data are consistent with the theoretical analysis results, and the measured data also show the correctness of the model. Based on the model established in this paper, the linear harmonic resonance overvoltage in the system is studied by analyzing the characteristics of traction network resistance frequency and the harmonic characteristics of AC DC electric locomotive. It is concluded that the harmonic overvoltage in the system is determined by the resonance frequency and harmonic current of the traction network, and the voltage appearing in the resonance is between 40kV-50kV, the voltage distortion rate is more than 3, and the duration is long. The ferromagnetic resonance overvoltage in this process is studied under the excitation condition of excessive phase of electric locomotive. It is found that the type of resonance is divide-frequency resonance. The maximum voltage of resonance is 108.9 kV, which exceeds the power frequency tolerance voltage of 400mm insulator. Finally, according to the characteristics of harmonic source, the parameters of high pass filter are designed by the method of minimum installation capacity to change the resonant frequency of the traction network and filter the harmonics. Through the simulation calculation of the installation position of different number of filters, it is found that one is installed on the locomotive and the other is installed in the partition. If the locomotive is difficult to install, The voltage can also be less than 40kV and the voltage distortion rate is less than 3kV when one is installed in the substations and the substations. From the aspects of weakening the excitation condition of ferromagnetic resonance and consuming resonance energy, a comprehensive suppression scheme based on contact line voltage phase control is proposed to control the over-phase of electric locomotive. The purpose of restraining the operating overvoltage and ferroresonance overvoltage is achieved. The overvoltage of the process is less than 50 kV. The research results in this paper can be used as a reference for the theoretical analysis of resonant overvoltage in traction power supply system and the treatment method of resonant overvoltage.
【学位授予单位】：北京交通大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U223;TM864
本文编号：2192637
[Abstract]:After the sixth speed increase of the railway in our country, with the application of the AC-DC model, accidents such as breaker tripping of substation circuit breaker, fuse of capacitor fuse, explosive slurry, explosion of lightning arrester and so on often occur in the traction power supply system. The above accidents are usually caused by the electromagnetic transient oscillation in the system caused by the large fluctuation of the traction load and the emergence of the internal over-voltage of the system, in which the resonant overvoltage is a typical one. In this paper, the resonance overvoltage in traction power supply system is studied by theoretical analysis and modeling and simulation. Based on the theoretical analysis of traction power supply system and AC-DC electric locomotive, the traction network model is established by using the overhead line model in PSCAD/EMTDC simulation software, which is expressed by distributed parameter circuit and can reflect the influence of frequency change on parameters. The control circuit of traction drive system based on rotor flux oriented control is established by using motor model as the load of pulse rectifier. The preliminary simulation results show that the obtained data are consistent with the theoretical analysis results, and the measured data also show the correctness of the model. Based on the model established in this paper, the linear harmonic resonance overvoltage in the system is studied by analyzing the characteristics of traction network resistance frequency and the harmonic characteristics of AC DC electric locomotive. It is concluded that the harmonic overvoltage in the system is determined by the resonance frequency and harmonic current of the traction network, and the voltage appearing in the resonance is between 40kV-50kV, the voltage distortion rate is more than 3, and the duration is long. The ferromagnetic resonance overvoltage in this process is studied under the excitation condition of excessive phase of electric locomotive. It is found that the type of resonance is divide-frequency resonance. The maximum voltage of resonance is 108.9 kV, which exceeds the power frequency tolerance voltage of 400mm insulator. Finally, according to the characteristics of harmonic source, the parameters of high pass filter are designed by the method of minimum installation capacity to change the resonant frequency of the traction network and filter the harmonics. Through the simulation calculation of the installation position of different number of filters, it is found that one is installed on the locomotive and the other is installed in the partition. If the locomotive is difficult to install, The voltage can also be less than 40kV and the voltage distortion rate is less than 3kV when one is installed in the substations and the substations. From the aspects of weakening the excitation condition of ferromagnetic resonance and consuming resonance energy, a comprehensive suppression scheme based on contact line voltage phase control is proposed to control the over-phase of electric locomotive. The purpose of restraining the operating overvoltage and ferroresonance overvoltage is achieved. The overvoltage of the process is less than 50 kV. The research results in this paper can be used as a reference for the theoretical analysis of resonant overvoltage in traction power supply system and the treatment method of resonant overvoltage.
【学位授予单位】：北京交通大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U223;TM864
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